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High order harmonics driven by an ultrafast IR parametric source were generated in aligned N2O and CO2; the experimental results are numerically reproduced taking into account the HOMO structure.
A continuous XUV spectrum was obtained by high-order harmonic generation driven by a multicycle, 15-fs driving pulse. The gating technique for XUV emission is based on a polarization tailoring of the driving electric field.
We investigated phase matching effects on high-order harmonics (HH) generated by a few-cycle parametric source in the near-IR. This source is characterized by 1.5 mum central wavelength, almost transform limited pulse duration of about 20 fs and pulse energy up to 1.2 mJ. The harmonic structure is resolved only on a portion of the spectrum, due to the finite instrumental resolution. We observed a...
We generated high-order harmonics with self-phase-stabilized near-IR pulses produced by a parametric source. We observed a significant cutoff extension whit respect to 800-nm driving pulses at comparable peak intensity. This result represents a step forward the generation of single attosecond pulses with photon energies exceeding 100 eV.
This work reports on the generation, compression and temporal characterization of isolated attosecond pulses down to the single cycle regime. The frequency resolved optical gating for complete reconstruction of attosecond burst (FROG-CRAB) technique has been used to fully characterize the temporal envelope and phase of the attosecond pulse. We have generated XUV broadband continua by high-order harmonic...
Summary form only given. In this paper, a scheme for the generation of high-energy, few-optical-cycle, carrier-envelope-phase (CEP) stabilized pulses in the IR around 1.5 mum is realised. The system is driven by a CPA Ti:sapphire laser (50 fs, 120 mJ, 800 nm, 10 Hz). A 0.6-mJ pulse is spectrally broadened by filamentation in a gas cell filled with krypton and compressed by chirped mirrors down to...
We present the generation of isolated attosecond pulses using phase-stabilized 5-fs pulses with time dependent ellipticity. Using a complete temporal characterization technique, we demonstrate compression of the pulses down to 130 as (<1.2 optical cycles).
Femtosecond pulses coupled to hollow-pyramid near-field probes allow achieving sufficient peak power to perform near-field nonlinear optics. We present second-harmonic generation images of nanostructured metal surfaces with spatial resolution better than 100 nm.
We generate ultrabroadband self-phase-stabilized near-IR pulses by difference-frequency generation of a hollow-fiber broadened supercontinuum followed by two-stage optical parametric amplification. Energies up to 20 muJ are demonstrated and a route for energy scaling is indicated.
In this work we report on a self-referencing technique for the measurement of the effect of the carrier-envelope phase (CEP) of the driving pulses on the phase difference between consecutive harmonics. By using a numerical model based on the nonadiabatic saddle-point method we demonstrate that, in particular experimental conditions, it is possible to directly control the electric field of the attosecond...
A highly-efficient nanometric source of second harmonic light is obtained by grazing-incidence illumination of a metal tip with high-energy 25-fs pulses of a Ti:sapphire oscillator. Polarization dependence complies with a nonlinear oscillating dipole model
For the first time we show, both experimentally and theoretically, that the spectral characteristics of the harmonic emission generated by light pulses in the multi-optical-cycle regime are significantly affected by the pulse carrier-envelope phase.
For the first time we show, both experimentally and theoretically, that the spectral characteristics of the harmonic emission generated by light pulses in the multi-optical-cycle regime are significantly affected by the pulse carrier-envelope phase
Summary form only given. We report on experimental and theoretical results concerning resonator design for cascaded second-order nonlinearity mode-locking (CSM) Nd:YAG lasers and pulse-duration optimization. The CSM critically depends on the nonlinear resonator losses. Since the nonlinear phase distortion arising from /spl chi//sup (2)/:/spl chi//sup (2)/ cascading is quite different from that resulting...
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